3D stereo browser for the internet

ABSTRACT

A viewer for viewing stereo images either downloaded over a network, such as the Internet, or resident on a personal computer uses a graphical user interface (GUI) to facilitate the display of wireframes with or without texture applied in a variety of formats. In stereo mode, the GUI permits adjustment of the neutral plane and of camera offset. The file sizes utilized with the viewer are very small and permit rapid transmission over a network. The files contain wireframe information, texture map information and animation information.

CROSS REFERENCE TO RELATED APPLICATIONS

This is a divisional of application Ser. No. 09/117,219, filed Jan. 13,1999 now U.S. Pat. No. 7,038,698, by Charles Palm and Brandie Lynn, thepriority date of which is claimed under U.S.C. § 120.

This application claims priority of U.S. application Ser. No. 60/011,356filed Feb. 8, 1996 which is hereby incorporated by reference in itsentirety.

BACKGROUND OF THE INVENTION

When capturing and reproducing 3-dimensional images in the prior art,information from one camera of a stereo pair of cameras was depicted asone color (e.g. orange) or band of colors and information from the othercamera of the pair was depicted in a complimentary color or color band.When viewing such images through 3-dimensional viewers, such as red/blueglasses, the reproduced image would not be perceived in color.

The orange elements in the picture are only seen through the blue lens,the red lens “washing out” the orange elements. For the same reason, thegreen-blue elements are only seen through the red lens. Hence, each eyesees only one of the two colored pictures. But because the differentcolored elements are horizontally shifted in varying amounts, theviewer's eyes must turn inward to properly view some elements, and turnoutward to properly view others. Those elements for which the eyes turninward, which is what the viewer does to observe a close object, arenaturally perceived as close to the viewer. Elements for which theviewer's eyes turn outward are correspondingly perceived as distant.Specifically, if the blue lens covers the viewer's right eye, as isgenerally conventional, then any blue-green element shifted to the leftof its corresponding orange element appears to the viewer as close. Theelement appears closer the greater the leftward shift. Conversely, as agreen-blue element is shifted only slightly leftward, not at all, oreven to the right of its corresponding red element, that element willappear increasingly more distant from the viewer.

When 3-dimensional images are captured, corresponding points of the leftimage are displaced from the same points in the right imagehorizontally. A measurement of the amount of displacement is called“disparity”. In the prior art when stereo images are made, the disparityfor all subject matter visible in both images is fixed. In digitalimages, disparity can be measured in terms of the number of pixels apoint on a left image is displayed from the corresponding point in theright image. Fixed focal length lenses are customarily used for thecameras

In an object with zero disparity, the corresponding pixels for the leftand right images are perfectly superimposed and the object appears to belocated on the screen. Zero disparity objects are seen most clearly whenthe eyes are crossed just enough to focus on the plane of the screen.Negative disparity objects appear to come out of screen toward theviewer and are seen most clearly when the eyes are more crossed.Positive disparity objects appear to be more distant than the screen andare seen most clearly when the eyes are less crossed.

The eyes cross or uncross in order to get similar image features on ornear the fovea of each eye. The “farthest” object that can be seen in ananaglyph is limited by the observers ability to comfortably uncross theeyes. (The usual limit to distant viewing is set by the condition wherethe eyes look along parallel axes, as when looking at a very distantobject such as a star in the night sky. When the eyes attempt to divergebeyond the parallel axes viewing limit, a “wall-eyed” condition existsthat is rarely comfortable to the observer.)

Some stereo images cover such a great range of depth and will have suchwidely varying values (even without a “zoom-in”) that some portions ofthe image will always be out of range of the observer's ability to seethe stereo effects, regardless of how the anaglyph was formed.

Three dimensional techniques are closely related to the psychology andphysiology of an observer's cognitive processes. Subtle changes inselection of portions of the spectrum presented to each eye can resultin significant changes in the observer's perception. Even when viewingthe same 3-dimensional image through the same viewers, differentobservers may perceive a 3-dimensional image in different ways.

The depth location of the point at which the left and right image pointsfor objects at that distance coincided constitutes a “neutral plane” andwhen observing a fixed disparity 3-dimensional image, the neutral planewould be found at the surface of the medium of reproduction (i.e. paperor CRT display). Items that appear closer than the medium surface andthose points in the image which appear behind the neutral plane wouldhave different disparity. The loss of depth perception when disparityexceeds a certain value generally means that when zooming-in on part ofa stereo image pair that disparity will become so great that depthperception will be lost.

In the prior art, there is no way to control an image so as to positionit either in front of or behind a neutral plane in a controllablefashion. This limits the ability to create 3-dimensional animations.

In addition, both anaglyphs in stereoscopic optical arrangements areknown which permit a user to view images in stereo either using red-blueglasses or separate optical channels for each eye.

Computer systems are also known which attempt to provide a sense of“virtual reality” by which a user perceives a computer generatedenvironment as if the user were immersed in that environment. Typically,these systems permit a measure of interaction between the user and thecomputer simulated environment. To make the virtual reality environmentsappear realistic, it is preferable that a user see the environment inthree dimensions or, in other words, in a stereo view.

The Problems

One of the serious problems of the prior art is the fact that threedimensional stereo presentations, whether static images or dynamicanimations of some sort, typically require much more memory than an XYimage that does not contain depth information or suffer from a loss ofresolution in the vertical image direction to “line interlace” effectsthat are necessary to convey “half-image” information to the left eyeand “half image” information to the right eye. The size of the filesassociated with a virtual reality presentation therefore constitute asubstantial impediment to the use of those files across networks,especially relatively low speed networks such as the Internet. This isespecially true for dynamic, animation presentations where even simplenon-stereoscopic-viewing “flick” files (Autodesk *.FLC and *.FLI files),audio-visual-interlace files (Microsoft *.AVI files) and Apple QuicktimeVR files can easily occupy 5–100 Mbytes of file space.

It would thus be desirable to have a “small file” size (20–300 Bytes offile space) virtual reality system which would permit rapid filetransfer across a relatively low speed network for interactive displaywith the user at the other end of the network connection.

Another problem with the prior art is that typically, even if the largefiles can be transferred, the processing required to render a surfacetexture on a three dimensional wire frame has been excessive. As aresult, extremely high performance work stations have been required todo even relatively simple transactions involving virtual reality orstereoscopic presentations.

Further, the generation of wire frames and their subsequent texturinghas been an extremely expensive, time consuming process. It would bedesirable to be able to capture images, create wire frames and packagethem for presentation to a user in a rapid, efficient and cost effectivemanner.

SUMMARY OF THE INVENTION

The problems with the prior art are overcome in accordance with oneaspect of the invention, by providing a three dimensional stereo viewerwhich is suitable for use with the Internet and with other relativelylow speed networks.

In accordance with another aspect of the invention, both wire frame,texture map information and animation information are stored in a singlefile for use in the rapid creation and rendering of three dimensionstereo images.

Another aspect of the invention lies in the very rapid capture andcreation of wire frames from image data and their subsequent texturingusing only relatively inexpensive and readily available personalcomputer systems.

The invention also relates to a computer having a processor, a memory,and a stereo viewer loaded in memory, said stereo viewer including agraphical user interface including a viewing window in which wireframescan be viewed with and without texture and a plurality of controls formanipulating a wireframe, a wireframe's texturing or a view of awireframe.

The invention also relates to a computer system, having a network, atleast one server connected to said network containing files of images tobe presented in stereo, a computer, having a memory and a browserapplication, connected to said network, for retrieving one or more filesof images to be presented in stereo, and a stereo viewer loaded in saidmemory, said stereo viewer including a graphical user interfaceincluding a viewing window in which wireframes can be viewed with andwithout texture and a plurality of controls for manipulating awireframe, a wireframe's texturing-or a view of a wireframe.

The invention is also directed to a method of storing wireframeinformation for presentation as a stereo image, by: storing x,y,zcoordinates of vertices of a wireframe together with X′Y′ coordinatesspecifying a corresponding location in a bit map containing texturinginformation.

The invention is also directed to a method of displaying wireframeinformation stored in a file, by extracting wireframe vertex informationand a compressed bit map from said file, decompressing said compressedbitmap, and displaying a wireframe specified by said wireframeinformation, with texture taken from said bitmap. Animation informationextracted from the file may also be used to control the display of thetextured wireframe in a sequence of different positions andorientations.

The invention is also directed to a computer program product, includinga memory medium, and a computer program stored on said memory medium,said computer program containing instructions for storing x,y,zcoordinates of vertices of a wireframe together with u,v coordinatesspecifying a corresponding location in a bit map containing texturinginformation.

The invention is also directed to a computer program product,comprising:a memory medium, and a computer program stored on said memorymedium, said computer program containing instructions for extractingwireframe vertex information and a compressed bit map from said file,decompressing said compressed bitmap, and displaying a wireframespecified by said wireframe information, with texture taken from saidbitmap The invention is also directed to a computer program product,including a memory medium, and a computer controlling information storedon said memory medium, said computer controlling information includingvertex location information for a plurality of vertices, a bit map oftexture for faces of a wireframe and a set of u;v coordinates for eachvertex pointing to a corresponding location on said bit map.

Still other objects and advantages of the present invention will becomereadily apparent to those skilled in the art from the following detaileddescription, wherein only the preferred embodiment of the invention isshown and described, simply by way of illustration of the best modecontemplated of carrying out the invention. As will be realized, theinvention is capable of other and different embodiments, and its severaldetails are capable of modifications in various obvious respects allwithout departing from the invention. Accordingly, the drawings anddescription are to be regarded as illustrative in nature and not asrestrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of an exemplary-computer and a server inaccordance with the invention used to retrieve and display threedimensional stereo information across a relatively low speed network,such as the Internet.

FIG. 2 is a block diagram of a computer architecture suitable for use incarrying out the invention.

FIG. 3 is a diagram of an exemplary software architecture suitable foruse with computer of FIG. 2 for running the stereo viewer of theinvention in a network application.

FIG. 4 is a diagram of an exemplary software architecture for use withcomputer of FIG. 2 for running the stereo viewer of the invention is astand alone application.

FIG. 5 is a flow chart of a process for downloading a 3D stereo fileover a network and for displaying and viewing the file.

FIG. 6 is a flow chart of a process for creating a wire frame filecontaining vertex information, texturing information and animationinformation (.vrx file) in accordance with the invention.

FIG. 7 is a flow chart of a process for creating a three dimensionalstereo display and optional animation from a .vrx file.

FIG. 8 is a representation of the wire frame defined in XYZ space asviewed on a screen in X′Y′.

FIG. 9 is an illustration how a change of view can be implemented as ageneralized coordinate transformation.

FIG. 10 is an illustration of camera positionings utilized in accordancewith the invention.

FIG. 11 is a representation of a Graphical User Interface (GUI) inaccordance with the invention.

FIG. 12 is a flow chart of an “Exit” function found on the graphicaluser interface as Icon No. 1.

FIG. 13 is a flow chart of an “Open File” process found on the graphicaluser interface as Icon No. 2.

FIG. 14 is a flow chart of a “Reset Center” process found on thegraphical user interface as Icon No. 3.

FIG. 15 is a flow chart of a “Reset Roll” process found on the graphicaluser interface as Icon No. 4.

FIG. 16 is a flow chart of a “Toggle Stereo” process found on thegraphical user interface as Icon No. 5.

FIG. 17 is a flow chart of a “Display Wire Frame” process found on thegraphical user interface as Icon No. 6.

FIG. 18 is a flow chart of a “Display Face Map” process found on thegraphical user interface as Icon No. 7.

FIG. 19 is a flow chart of a “Display Textured Object” process found onthe graphical user interface as Icon No. 8.

FIG. 20 is a flow chart of a “Magnify”/“Reduce” processes found on thegraphical user interface as Icons Nos. 9 and 10 , respectively.

FIG. 21 is a flow chart of a “Spin Object” process found on thegraphical user interface as Icon No. 11.

FIG. 22 is a flow chart of a “Animate Object” process found on thegraphical user interface as Icon No. 12.

FIG. 23 is a flow chart “Move Neutral Plane In”/“Move Neutral Plane Out”processes found on the graphical user interface as Icons Nos. 13 and 14,respectively.

FIG. 24 is a representation of “Increase Camera Offset”/“Decrease CameraOffset” processes found on the graphical user interface as Icons Nos. 15and 16, respectively.

FIG. 25 is a flow chart of an “About” process found on the graphicaluser interface as Icon No. 17.

FIG. 26 is a flow chart of a “Help” process found on the graphical userinterface as icon No. 18.

FIG. 27 is a flow chart of a “Display Wireframe and Texture Map” processfound on the graphical user interface located as icon No. 19 or locatedbetween icons 7 and 8.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a block diagram of an exemplary computer and a server inaccordance with the invention used to retrieve and display threedimensional stereo information across a relatively low speed networksuch as the Internet. A computer terminal 100 is connected to thenetwork 110. During the time that a user of computer 100 is connected tothe network, the user may connect to a network host 120, such as a website or other computer running a server process. Computers operatingover a network often utilize a client server paradigm. A client processrunning on computer 100 may request that a network server such as 120perform certain functionality. Generally, the service is requested inthe form of a message and the results of that service, that is theinformation obtained in the processing requested, is returned from theserver to the client (user terminal 100) over the network also in amessage.

FIG. 2 is a block diagram of a computer or architecture suitable for usein carrying out the invention.

A central processing unit (CPU) 200 is connected to bus 210. A drivecontroller 220 is also coupled to the bus 210 for controlling writing toand reading from a variety of drives. Theses drives may be a CDROM 221,a hard drive 222, a floppy drive 223 or some other device which can bemodeled as a drive. Display controller 225 interfaces the computerdisplay, such as a cathode ray tube or a semiconductor or liquid crystaldisplay. An I/O controller 240 interfaces both the mouse 250 and thekeyboard 245 and manages the gathering of information required tointeract with the user during the use of the computer. Communicationsport 260 is also connected to bus 210 and serves to provide a link to anetwork, if a network connection is desired.

FIG. 3 is an illustration of preferred software architecture for usewith a computer of FIG. 2 for running the stereo viewer of the inventionin a network application. This software is built up in layers reflectingtheir relative distance from the actual hardware being controlled. Atthe lowest layer, the operating system 300 is found. The operatingsystem provides suite of services accessible to higher levelapplications for causing the computer to operate. Browser software 310is loaded on top of the operating system. An important part of browser310 is the existence of communication software which provides access toeither a network or to external devices. The communications layer isshown as extended partially into the browser area and also as by-passingthe operating system and going directly to the hardware. This isintended to reflect that communications software can be implemented indifferent ways. In one form, communications software utilizes theservices of the operating system. In other systems, it may be desirableto completely by-pass the operating system's communications capabilitiesand to write a device driver which directly accesses the hardware,by-passing the operating system. Intermediate systems also occur inwhich only part of the needed functionality accesses the hardwaredirectly and the remainder uses operating system services. A .vrx viewer330 is shown resident on the computer. Typically, the .vrx viewer willbe configured for a helper application to the browser software. Helperapplications are well-known in the art and are easily implemented usingtraditional browser software.

The operating system is preferably the Windows 95 operating system fromMicrosoft. The browser 310 is preferably the Netscape browser fromNetscape Communications Corporation. The .vrx viewer 330 is the subjectof this application and is discussed more hereinafter.

FIG. 4 is an illustration of a software architecture for use with thecomputer of FIG. 2 for running the stereo viewer of the invention in astand alone mode. The operating system 400, in a stand alone mode,provides all of the functionality required for the .vrx viewer 410 tofunction. Again, the operating system is preferably Windows 95.

FIG. 5 is a flow chart of a process for downloading a 3D stereo file(.vrx file) over a network in accordance with the invention. First, the.vrx file is down loaded, e.g., from a web site or other location on anetwork, and is stored in the memory space of computer 100 (500). Thecomputer 100 detects that file is a .vrx file and loads and executes the.vrx viewer resident on the computer 100 and then opens the down loaded.vrx file in the viewer for manipulation and display (520).

FIG. 6 is a flow chart of a process for creating a wire frame filecontaining wireframe information, texturing information and animationinformation (.vrx file) in accordance with the invention. In a preferredmode of carrying out the invention, left and right images are capturedof a scene to be rendered in a wire frame. The two images are thenloaded into a software product “Wire Frame Express” (610) fromSynthonics Technologies Incorporated. Corresponding points on the leftand right images are identified and a wire frame automatically generatedresulting in a .3DP file of wire frame vertices. In the .3DP file, theX, Y, and Z coordinates of each vertex are identified, and the U,Vcoordinates are generated identifying corresponding points on thetexture map to be utilized. U,V coordinates are well-known in the art.They typically represent a relative position on the bit map expressed asa decimal fraction, whereas X′ and Y′ represent absolute addresses.However, the U,V coordinates for a particular X, Y, Z vertex representthe position of the X, Y, Z point on the bit map used to providetexturing. In the case illustrated in FIG. 6, the bit map used toprovide texturing is one of the L1 or R1 images shown in block 600. Eachvertex is associated with a particular face or surface element utilizedfor rendering texture on the wire frame representation.

The one of the L1 or R1 images to be utilized for providing texture isconverted to a .jpg (JPEG—(Joint Motion Pictures Expert Group)) standardformat and compressed at step 650. Compression algorithms other thanJPEG may be used. They include Fractal compression, Wavelet compression,and many others. JPEG was selected because of the universal use by thePC community of graphical users. The .3DP file as output from the WireFrame Express may require some conversion of format before being passedto the rendering engine for the application of texture to a wire frame(630). The file format utilized in this particular application, is a.dat file and is a format required by the preferred rendering engine. Inthe preferred embodiment, the rendering engine is BRender, version1.1.2, produced by Argonaut Technologies Limited of Capitol House,Capitol Way, Colindale, London NW9 0DZ, United Kingdom. Alternativerendering engines can be “Reality Lab” 3D Application ProgrammingInterface by RenderMorphics Ltd, 3DR and MMX technology by Intel andDirectX by Microsoft.

The .jpg texture map and the .dat wire frame representation from blocks640 and 630, respectively, are compressed in block 650, the output ofwhich forms the .vrx viewer file 660. The particular compressionalgorithm utilized is not important. What is important is that it isdesired to have both the wire frame information from block 630 and thetexture information from block 640 in a single file. This avoids havinga fragmented downloading process and permits all information to beavailable for viewing at the viewer.

Note that there are relatively few products which will create wireframes from two digital images of the same scene. The Wire Frame Expressproduct from Synthonics Technologies of Westlake Village, Calif.,permits this to be done with great facility and with great economy ofvertices. As a result, the resulting file sizes are considerably smallerthan would otherwise be required.

Note also that when utilizing images for the creation of wire frames, itis often desirable to take pictures of a three-dimensional object atapproximately every 30 degrees of solid angle so that wire framescreated utilizing pairs of adjacent pictures can be pieced together intoa wire frame covering 360 degrees of solid angle. This is not required,however, it is desirable when a large portion of a real object is to bemodeled. When a model is piecewise constructed in the manner justdescribed, the construction of the .vrx viewer file will include aplurality of segments, each segment constituting wire frame verticesconverted in a manner suitable for the rendering engine together withbit map image information selected for use with that wire frame. Thus, amulti-segment project will have a plurality of files of wire framevertices and respective bit mapped texture information which can beassembled into an entire textured model of the object.

FIG. 7 is a flow chart of a process for creating a 3D stereo displayfrom a .vrx file. When a .vrx viewer file is opened using the viewer, asdescribed more hereinafter, the compression applied to the components atstep 650 is reversed a block 710 and the .dat file components separatedfrom the .jpg file components (740 and 720 respectively). The .jpg filecomponents are decompressed (730) down to raw pixel data. This isnecessary because the .jpg encoding algorithm itself inherentlycompresses. The .dat file is passed to the rendering engine as well asthe raw pixel data from block 730. Then rendering engine then displaysthe information in a viewing window for the user to view and manipulate(760). the animation information 770 affects the display of thewireframe by causing the position, orientation and view of the object tobe sequentially changed in an animation sequence.

FIG. 8 is a representation of a wire frame defined in XYZ space as it isviewed on a screen in X′Y′. Each vertex of the wire frame model has X, Yand Z coordinates associated with it. Those coordinates implicitlydefine an origin for the XYZ coordinate system and, in the case shown,that coordinate system utilized to capture the wire frame. Computersystems generally display only two dimensional information on a flatsurface. Thus, the way a particular point from a three dimensional spaceis mapped on to a two dimensional screen essentially involves taking aray projection from the point in three space and running to the viewingposition, or, in this case, the origin for the X, Y, Z coordinate systemand finding out where that line intersects a display screen. In short,the origin constitutes a point which serves as a perspective for viewingthe wire frame model. Knowing where the wire frame map vertices arelocated and knowing where the origin of the coordinate system is, for anarbitrary viewing plane, between the two, the proper points to beutilized to represent the image in a two dimensional screen space arethe points X′Y′. They are determined by calculating simply theintersection of a line between the origin and a particular X, Y, Zvertex and the plane upon which the object is displayed.

Although a particular coordinate system may be utilized to define a wireframe, when the wire frame so defined is moved to a different system, itwill be viewed from a different perspective location, such as the originof the L, M, N coordinate system. Thus, the projection of vertices, L,M, N on a plane between the vertex and the origin will define an L′M′intersection point. Note that the value of X, Y, Z can be related to thevalue of L, M and N by a simple generalized coordinate transformation.

FIG. 10 is an illustration if camera positioning utilized in accordancewith the invention. When viewing a wire frame from a viewing origin,such as L, M, and N of FIG. 9, there are two modes utilized. In onemode, no stereo information is presented. When implementing the .vrxviewer in accordance with the invention, when stereo information is notutilized, the wire frame is viewed as if there were a camera pointlocated at L, M, N (1110). When stereo information is to be utilized,instead of camera 1110, cameras 1120 and 1130 are utilized. Thesecameras are separated by camera offset D shown in FIG. 10. Left andright cameras capture respective views of the wire frame.

FIG. 11 is a representation of a graphical user interface in accordancewith the invention. The graphical user interface comprises four mainareas. The first is a title bar 1100 containing the title of thesoftware being utilized. On the same line, in block 1110, informationabout the location of the neutral plane and camera separation isdisplayed. A viewing window 1120 permits the viewing of a threedimensional object 1130 in different modes. The particular operationalmodes available to a user and the selections permitted are representedby Icons Nos. 1–18 shown between the viewing window 1120 and the titlebar 1100 and 1110. The function and use of the individual icons arediscussed more hereinafter. However, they are listed here forconvenience:

Icon No. Description  (1) EXIT  (2) File Open  (3) Reset Center  (4)Reset Roll  (5) Toggle Stereo  (6) Display Wireframe  (7) Display FaceMap  (8) Display Textured Object  (9) Magnify (10) Reduce (11) SpinObject (12) Animate Object (13) Move Neutral Plane In (14) Move NeutralPlane Out (15) Increase Camera Offset (16) Decrease Camera Offset (17)About (18) Help (19) Display Wireframe and Texture Map

FIG. 12 is a flow chart of an “Exit” function found on the graphicaluser interface as Icon No. 1. When the “Exit” icon is selected (1200)all files opened by the .vrx viewer are closed (1210), the screen iscleared (1220) and the program exits (1230).

FIG. 13 is a flow chart of an “Open File” process found in the graphicaluser interface as Icon No. 2. When “Open File” is selected (1300), awindow is opened displaying files with the .vrx extension (1305). Theuser selects a desired file, “cancel” or “browse.” If the use selects“cancel,” the window is closed and the process awaits the next “openfile” selection. If “browse” is selected, the user may selectivelybrowse other levels of the menu hierarchy to find .vrx files which mightbe displayed and used with the invention. If the user selects a file(1310-files selected), the .vrx file is decompressed (1330) into itsconstituent parts. The wire frame information in the .vrx file is thenutilized to build a wire frame. The .jpg portion of the .vrx fileretains the JPEG compression; however, it needs to be decompressed foruse in displaying the raw image information (1335). The textureinformation from the .jpg file is applied to the surface elements of thewire frame to result in display of a textured wire frame which iscentered in the viewing window and positioned at the default rotation(1340). The position and orientation of the wireframe and/or the view ofthe wireframe (camera position and/or orientation) can be changed in aseries of steps in accordance with animation information (1345). Theprocess then ends (1350).

FIG. 14 is a flow chart of a “Reset Center” process found on thegraphical user interface as Icon No. 3. When the “Reset Center” processis selected (1400), the displayed textured wire frame is returned to acenter position on the screen without changing its rotation (1410), andthe process ends.

FIG. 15 is a flow chart of a “Reset Roll” process found on the graphicaluser interface as Icon No. 4. When “Reset Roll” process is selected(1500), the wire frame image is returned to its default rotation settingwithout otherwise changing the location of that image on the viewingwindow (1510), and the process ends (1520).

FIG. 16 is a flow chart of a “Toggle Stereo” process found on thegraphical user interface as Icon No. 5. By pressing the “Toggle Stereo”button one time, it changes from whatever mode it was in (mono orstereo) to the other mode. If mono is the mode selected after the toggle(1610-M), the view of the center camera described in FIG. 11 is utilizedto capture image information. The view from the center camera is thendisplayed in the viewing window (1650), and the process ends. However,if the stereo mode in effect after the toggle (1610-S), imageinformation from both the L and R camera (1020 and 1030, respectively)are utilized to form a stereo image. For example, the stereo image ispreferably constructed by utilizing the red image plane from one cameraview and the blue and green image planes from the other camera view andforming them into an R, G, B composite which can be viewed throughtraditional colored stereo glasses (1630).

FIG. 17 is a flow chart of a “Display Wire Frame” process found on theGraphical User Interface as Icon No. 6. When “Display Wire Frame”process is selected (1700), a wire frame mesh without any surfacetexture is displayed at a default location and rotation (1710) and theprocess ends.

FIG. 18 is a flow chart of a “Display Face Map” process found on thegraphical user interface as Icon No. 7 (1800). The wire frame can bedisplayed as discussed in the preceding flow chart. In the “Display FaceMap” mode, the wire frame is textured with a surface texture (e.g.,plain grey) (1810), and the textured wire frame is illuminated with asource of illumination at a fixed point viewed from a center cameralocation. The textured wire frame is viewed at its current location andorientation (rotation). If the wire frame were not illuminated with alight source, all grey texture would appear equivalent andindistinguishable. Thus, one would not be able to see the textureboundaries very well.

FIG. 19 is a flow chart of a “Display Textured Object” process found onthe Graphical User Interface on Icon No. 8. When “Display TexturedObject” is selected (1900), texture is applied to the wire frame fromthe texture map from the .vrx file (1910). The textured wire frame isdisplayed at its default location and orientation (1920), and theprocess ends.

Thus, Icons 6, 7, 8 and 19 describe four different image modes. In thefirst, only the wire frame is displayed. It had no texturing. In thesecond, a very plain texture is applied to the wire frame. In the thirdbit map information from the .vrx file is utilized to apply texture forthe wire frame and in the fourth, both the wireframe and the texturedobject are displayed.

When captured using Wire Frame Express, the vertex information for thewire frame contains many fewer vertices than would be otherwise requiredif a wire frame were created, for example, using a Cyberware scannerknown from the prior art. In Wire Frame Express, large areas can becircumscribed by points forming a closed polygon around a loop. Withsuch surface elements defined, the texture bit map can be applieddirectly to the area circumscribed by the polygon. Certain types of wireframe handling products are incapable of handling polygons, but requireinstead triangles. If that is the case, the area bounded by the polygoncan be partitioned into triangular subelements and texture applied tothe individual subelements accordingly. The file output from Wire FrameExpress includes, the X, Y, Z, and X′Y′ locations points discussed inconnection with FIGS. 8 and 9.

Each vertex is associated with a pair of coordinates U and V whichrepresent the relative position of that vertex in the bit mapped imageutilized to apply texture. For example, if the raw pixel data derivedfrom decompressing at both the .vrx and .jpg level into raw pixel data,contained 1,000 pixels in a horizontal direction and 1,000 pixels in avertical direction for display, a pixel located at point 100,100 wouldbe identified by UV coordinates as U=0.1 and V=0.1. The 0.1 representson a scale, typically from zero to one, the percentage of displacementin the X direction or the percentage of displacement in the Y directionwhere the bit map texture information for that vertex begins. Thus, whentexturing a wire frame, the U,V information contained in the Wire FrameExpress file format is passed to the rendering engine so that it willknow exactly where to begin placing texture information on a particularface of the surface bounded by vertices.

FIG. 20 is a flow chart of processes designed to “Magnify” and “Reduce”the selected object. These correspond to Icons 9 and 10 of the GraphicalUser Interface. When “Magnify” or “Reduce” is selected (2000), if thecursor is in the viewing window (2010) and if the left mouse button isheld down (2020), the wire frame representation of the real world objectis scaled up (down) by an amount related to the distance the mouse moveswhile the left mouse button is held down (2030), and the process ends.

FIG. 21 is an illustration of a “Spin Object” process found on thegraphical user interface as Icon No. 11. When “Spin Object” is selected(2100), a determination is made whether the cursor is in the viewingwindow (2110) and whether the left mouse button is down (2120). If bothconditions are true, the wire frame is rotated about a vertical axis ifthe mouse moves left or right by an amount related to the sum of L-Rmouse movements (2130). However, the wire frame is rotated about ahorizontal axis, if the mouse moves up or down, by an amount related tothe sum of up-down movements of the mouse (2140).

FIG. 22 is a flow chart of an “Animate Object” process-found on thegraphical interface as Icon No. 12. When “Animate Object” is selected(2200), for each entry in the animation file, the object position andorientation and the corresponding camera(s) position and orientation areread and used to position the wireframe and its view as specified by theentry from the animation information or file.

FIG. 23 is a flow chart of “Move Neutral Plane In” and “Move NeutralPlane Out” processes found on the graphical user interface as Icons Nos.13 and 14. If the cursor is in the viewing window (2320) and if the leftmouse button is down (2330), with the cameras' separation fixed, thecameras are moved closer to/farther from the wire frame by an amountrelated to the distance the mouse moves while the left mouse button isdown (2340).

FIG. 24 is a flow chart of “Increase Camera Offset”/“Decrease CameraOffset” processes found on the graphical user interface as Icons Nos. 15and 16. When “Increase”/“Decrease Camera Offset” is selected (2410), foreach left mouse click, the left and right camera separation isincrease/decreased by an incremented amount. Thus, by repeatedapplication of the mouse click a relatively arbitrary amount of cameraseparation can be achieved.

FIG. 25 is a flow chart of an “About” process found on the graphicaluser interface as Icon No. 17. When “About” is selected (2500), adisplay window is opened and information is displayed in that displaywindow about the viewer and the company manufacturing the viewer (2510).Other information may also be provided selectively to a user.

FIG. 26 is a flow chart of a “Help” process found on the graphical userinterface as Icon No. 18. When “Help” is selected (2600), a helpapplication is opened (2610) in a separate window and may be navigatedand utilized by a user to obtain the desired help information.Typically, the help application includes search functionality as well aspagination and printing functionality.

FIG. 27 is a flow chart of a “Display Wireframe and Texture Map” processfound on the graphical user interface as icon No. 19 or located betweenicons 7 and 8. When “Display Wireframe and Texture Map” is selected(1900), texture is applied to the wire frame from the texture map fromthe .vrx file (1910). The textured wire frame is displayed at itsdefault location and orientation (1920), and the process ends. Inaddition, the wireframe is also made visible. This allows the developerof a model to more easily detect the location of “missing face” elementsand also allows the viewer to see something in the viewing window incase the model has texture maps only on the “back side” of the model assometimes occurs when the model is essentially a sculpted, almost flatobject like a picture frame.

In the preceding, a graphical user interface has been described whichovercome the problems of the prior art and permits the rapid, efficientand cost effective display of three dimensional stereo information tothe user.

There has been shown and described only the preferred embodiment of theinvention, but, as aforementioned, it is to be understood that theinvention is capable of use in various other combinations andenvironments. It is capable of changes or modifications within the scopeof the invention concept as expressed herein.

1. A computer system, comprising: a. a network, b. at least one serverconnected to said network containing files of images to be presented instereo, c. a computer, having a memory and a browser application,connected to said network, for retrieving one or more files of images tobe presented in stereo, and d. a stereo viewer loaded in said memory,said stereo viewer including a graphical user interface including aviewing window in which wireframes can be viewed with and withouttexture and a plurality of controls for manipulating a wireframe, awireframe's texturing or a view of a wireframe.
 2. The computer systemof claim 1, in which said stereo viewer is loaded as a helperapplication for said browser application.